Comparison

Frontier X vs SLEEPON 3

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Frontier X

Track your heart health and exercise performance with a smart chest strap monitor. Gain detailed insights into heart rate, rhythms, and training load. Receive personalized feedback and alerts to optimize your workouts and understand your body better.

Highlights
  • Heart Health Monitoring
  • Real-time Heart Rate & HRV
  • Breathing Rate & Strain Tracking
  • Activity Recording (24hrs)
  • Personalized Vibration Alerts
  • AI-enabled Training Insights
  • Metabolic Profile Analytics (Premium)
Features
Read full description

With your Frontier X/X2/X3, track your activity including exercise, rest or sleep to get detailed insights on heart health and exercise performance. This companion app allows you to connect with Frontier X2/X3 - a revolutionary chest strap wearable smart heart monitor and view your recorded data. Trusted by world-class athletes across the globe, the Frontier X2/X3 is a chest-worn Smart Heart Monitor that provides in-depth real-time feedback on your heart health. It can monitor your: - Heart Health - Heart Rate - Heart Rate Variability (HRV) - Breathing Rate - Strain - Rhythms - Training Load - Calories - Stress, and a lot more. • Accurately record your activity like exercise, running, cycling, resting, sleeping, meditation, etc for up to 24hrs with comprehensive heart health insights. • Spot changes in your heart health with Rhythm and Strain. • Train in the right zone without distractions with real-time, personalized, and discreet vibration alerts. • Add health event tags to help you understand how lifestyle choices and behavior affect your health. • Seamlessly integrate with Bluetooth-enabled wearables and third-party devices such as GPS sports watches, bike computers, and more. • AI-enabled algorithms - Receive post-activity training insights, recommendations, and weekly goals. • Frontier X integrates with HealthKit to export your Frontier X activities into the Health app and to read heart rate and biometric data. • IP67 Waterproof up to 1.5 M • Battery: 14+ days of typical use Now get deeper insights and data with Frontier Premium Subscription*: Metabolic Profile Analytics: Track training intensity and the impact of lifestyle changes on metabolic health with key metrics like VO₂ Max, VO₂ Zones, Oxygen Uptake, and Ventilatory Thresholds (VTs). VO₂ Max: Get the most accurate real-time VO₂ Max data. While other wearables estimate using motion and heart rate, our advanced algorithms provides precise VO₂ Max readings outside of a lab, tracking cardiovascular efficiency and endurance potential. Readiness Score: Determine if your body is ready for peak performance or needs recovery. Advanced algorithms use heart rate, heart rate variability (HRV) to guide your daily activities and training. Sleep Stage Analysis: Get a comprehensive understanding of your sleep quality (Webapp). With Frontier's Premium subscription and Metabolic Profile Analysis, tracking your VO₂ max becomes simpler and more precise. *A Paid Frontier Premium subscription is required to access the full feature set . The Premium feature subscription comes with a complimentary 7 days free trial, and continue at a minimal monthly cost starting from USD 14.99, or opt for an annual plan for substantial savings. Please note that prices may fluctuate based on your geographical location, currency, and current exchange rates The Terms of use are available in the app and our website: https://in.fourthfrontier.com/pages/terms-of-use About Fourth Frontier Fourth Frontier is an innovative health-tech company focused on revolutionizing heart health monitoring with its cutting-edge wearable technology. We are the World’s First Smart Heart Monitor. With over 5 billion heartbeats recorded from 120,000+ users across 50+ countries, we are empowering users to understand and manage their heart health in real-time. These features make the Frontier App a comprehensive tool for heart health management and fitness improvement. Download the app today and access the most accurate heart health data available. Apps available for iPhone and Apple Watch.

About

SLEEPON 3

This system provides a home sleep testing solution using a wearable device and a mobile app. It analyzes sleep data to identify potential issues and build long-term sleep profiles for proactive risk assessment. It's designed for various age groups and individuals with specific health concerns.

Highlights
  • Home sleep testing system
  • Wearable sleep ring
  • Companion mobile application
  • sleepFit™ algorithm
  • Vital biological data capture
  • Sleep health issue identification
  • Long-term sleep profile establishment
Features
Read full description

SLEEPON 3 offers a comprehensive home sleep testing system, featuring the go2sleep device paired with intuitive mobile applications. Powered by the advanced sleepFit™ algorithm, SLEEPON 3 accurately captures vital biological data via its sleep ring and companion app. This innovative solution not only identifies potential sleep health issues but also facilitates the establishment of long-term sleep profiles, enabling proactive risk assessment. Designed for individuals of all ages, SLEEPON 3 is particularly beneficial for middle-aged and elderly individuals, professionals, patients with chronic cardiovascular conditions, those struggling with obesity. Experience peace of mind knowing that SLEEPON 3 serves as a dedicated guardian of your family's sleep health. DISCLAIMER: This product is not a medical device. All data and suggestions provided by "SLEEPON 3" are intended to help you understand your sleep condition and are for reference only. They should not be taken as clinical diagnoses. Please consult a professional doctor before making any medical decisions. Jurisdiction Statement: This application is intended for use in China. We control and operate in the aforementioned countries; unless otherwise stated, the materials displayed on this app are solely for the purpose of promoting products and services in these countries. We make no representations regarding the applicability or suitability of any materials on this app in any other locations. If you choose to access this app from other locations, you are responsible for complying with the applicable local laws.

Screenshots

Frontier X4 screens
SLEEPON 34 screens

Verdict

The call

The clearest difference is review sentiment: Frontier X at 82% against SLEEPON 3's 35%. Frontier X also leads on rating (4.6 vs 2.0) and ratings volume (318 vs 40). SLEEPON 3's advantage is in-app purchases (none vs 2) and iOS requirement (13.0 vs 16.0). On price, update cadence, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Frontier X sells 2 in-app purchases, starting at $14.99 per month. SLEEPON 3 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Frontier X holds the better App Store score, 4.6 against 2.0. That said, the two scores are not equally well evidenced: Frontier X has 318 ratings behind it against 40, so its average is the more settled of the two. Written reviews point the same way: 82% of Frontier X's written reviews are positive against 35% of SLEEPON 3's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

Scorecard6 real differences · 4 level
Frontier X versus SLEEPON 3: the parameters behind the verdict, then further details
ParameterFrontier XSLEEPON 3
PriceFreeFree
Rating4.6 (318 ratings) — better2.0 (40 ratings)
Positive reviews81.8% of reviews — better35.2% of reviews
Number of ratings318 — better40
Update frequencyEvery 3 weeksEvery 3 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, Apple WatchiPhone, iPod
Requires iOS16.013.0 — better
Further details — not scored
Size569 MB67 MB
Age rating4+17+
DeveloperFourthfrontierShenzhen Sleepon Technology Co., Ltd.

Customer experience

Frontier X

All ratings318 ratings
Positive90.9%
Neutral1.3%
Negative7.9%
Written reviews137 reviews
Positive81.8%
Neutral1.5%
Negative16.8%

SLEEPON 3

All ratings30 ratings
Positive23.3%
Neutral3.3%
Negative73.3%
Written reviews54 reviews
Positive35.2%
Neutral1.9%
Negative63.0%

User reviews

Frontier X

From 318 App Store ratings

What we love

  • 🚀 Amazing device
  • 👍 Great HR data and insight
  • 👍 Helpful in gaining more data
  • 👍 Fantastic concept with excellent execution
  • 👍 Loads of useful information

Room to improve

  • 🐛 Worse and worse as time goes by
  • 🐛 ECG doesn't work
  • 🐛 Chest strap issues, device keeps popping out
  • 🐛 Paywalled functionality
  • 🐛 Syncing issues, device keeps disconnecting

SLEEPON 3

From 40 App Store ratings

What we love

  • ❤️ Accurate blood oxygen testing
  • 👍 Comfortable to wear
  • 💡 Comprehensive sleep data
  • 😊 Improved app after updates
  • ✅ Works as advertised

Room to improve

  • ❌ Network error nonstop
  • ❌ App won't sync with Apple Health
  • ❌ App requires website login
  • ❌ Device stopped working
  • ❌ Bluetooth connection dropping

Bugs and requests

Frontier X

Reported bugs

4 issues
  • ECG stopped working
  • Inaccurate breathing rate and other metrics
  • Inability to edit activity details for indoor workouts
  • Syncing issues with Garmin devices after firmware updates

Requested features

6 requests
  • Add interval markers
  • Improve integration with Apple Fitness/Fitness+
  • Add support for ANT+
  • Improve compatibility with other fitness apps and devices
  • Add more customization options for workouts
Show 1 more
  • Improve data visualization and analysis tools

SLEEPON 3

Reported bugs

63 issues
  • Network error nonstop
  • App constant network error
  • App won't sync with Apple Health
  • App won't open unless signed into website
  • Device stopped working
Show 58 more
  • Bluetooth connection dropping
  • Cannot get any results trying to log in
  • Cannot add a new account
  • Network error
  • Connectivity issues to the cloud
  • Cannot log on to account
  • Data won't synchronise to the cloud
  • Lost sleep data
  • Device has not worked properly
  • App never updates
  • Sign up not secure
  • New account sign up not secure
  • Password generation not working
  • Forces manual entry of security code
  • No HealthKit Integration
  • App doesn't sync with Apple Health
  • Device syncs with SleepOn 3 but SleepOn 3 doesn't sync with Apple Health
  • Data just never syncs
  • App seems wildly inaccurate
  • Device wildly different from other trackers
  • Unausgereift App
  • No support for Fingerkuppenhalterung
  • Unzuverlässige und teilweise keine Aufzeichnung
  • Kein Hinweis, dass nicht aufgezeichnet wurde
  • Unübersichtliche Konfiguration
  • Kein Hinweis, dass ein Update verfügbar ist
  • Actual time is wrong
  • Shows 'real time' heart rate and oxygen when not wearing the ring
  • Won't connect most nights
  • Constantly drained phone battery
  • Device does not shut down when not in use
  • New version is not as good as the original
  • Have to keep syncing the ring to the phone
  • Network connection error after iOS update
  • Blood glucose testing does not save results
  • Data only displayed every second night
  • Device does not work
  • Reads pulse O2 of 70-80% compared to typical 97%
  • Malfunctions
  • Screen shot upload does not work
  • Syncing issues
  • App drains battery
  • No response from customer service
  • Blood glucose measurement is worthless
  • No option to select mmol/L for Blood glucose
  • Time stamp for Blood glucose is way-way off
  • Did not record waking up and walking around during the night
  • App is overwhelming
  • Sleep apnea monitoring is gone
  • Ring holder does not accurately sense oxygen
  • Only the fingertip holder does
  • Maybe one in four times the data will sync
  • No response from support
  • Will not download data
  • Bug step backwards
  • Firmware update made the ring incompatible
  • App requires website login
  • No way to prevent cloud upload

Requested features

13 requests
  • Add Apple Health integration
  • Add vibration alarm
  • Add sleep apnea monitoring (AHI)
  • Add adjustable cards feature
  • Allow editing of sleep time
Show 8 more
  • Add option to select mmol/L for Blood glucose
  • Improve blood glucose measurement accuracy
  • Fix blood glucose timestamp issues
  • Provide professional displays/charts
  • Enable screenshot upload
  • Add fingertip version setting
  • Add support for Fingerkuppenhalterung
  • Add dark mode option

In-app purchases

2 purchases

Frontier X

Subscriptions2
  • Monthly7 Days trial$14.991 Month
  • Yearly7 Days trial$119.991 Year
None

SLEEPON 3

No in-app purchases

Questions

Is Frontier X free?
Frontier X is free to download, with in-app purchases available.
Is SLEEPON 3 free?
SLEEPON 3 is free to download, with no in-app purchases.
Which has better reviews, Frontier X or SLEEPON 3?
Frontier X is rated higher. Frontier X averages 4.6 out of 5 from 318 ratings, while SLEEPON 3 averages 2.0 from 40 ratings.
Do Frontier X or SLEEPON 3 have ads?
Neither Frontier X nor SLEEPON 3 shows ads.
Which is updated more often, Frontier X or SLEEPON 3?
Frontier X ships an update every 3 weeks, and SLEEPON 3 every 3 weeks. Most recently, Frontier X was updated on October 25, 2026 and SLEEPON 3 on October 24, 2026.

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